A very lucky photographer recently snapped musical titans Jay-Z, Justin Timberlake, Nas and Timbaland in the studio together and uploaded the shot to Instagram for our gawking pleasure. Which forces the question, "What are they building in there?"

Short answer: We don't really know.

Long answer: The photo's caption reads "JAY x JT x NAS x TIMBO Rat Pack sh-t. For some this is 'Work'... For us it's just Fun. #RocNation"

So it seems they're recording material. Well, Timberlake and Timbaland in the studio together is no surprise. Same goes for summer tour buds Jay-Z and JT. Nas is really the odd man out here, but a tantalizing addition. Does this mean he'll be on the sequel to The 20/20 Experience? Or Hova's upcoming album? Or are they just discussing the political turmoil in Turkey? And if so, why are they laughing so hard? That's pretty insensitive, guys.